Annealing-furnace.



frn sr rns PATENT ANNEALING-FURNACE.

To all whom it may concern Be it known that I, GEORGE J. HAGAN, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Annealing-Furnaces, of which improvements the following is a specification.

The invention described herein relates to certain improvements in furnaces for malleableizing castings, and has for its object a construction permitting of the use of solid fuel and also permitting of the removal of the treated castings from the annealing box by an electro-magnet,

The invent-ion is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Figure 1 is a sectional elevation longitudinal of the furnace; Fig. 2 is a sectional plan on a plane indicated by the line II-II Fig. 1, and Figs. 3 and 4 are sectional elevations transverse of the furnace the planes of section being indicated by the lines IIIIII and IVIV Fig. 1.

In the practice of my invention a flue 1 is formed in the foundation or lower portion of the furnace structure and fire chambers 2 are arranged at one or both ends of this flue dependent upon the length of the furnace. The products of combustion escape from the top of this flue through passages 3 extending in opposite directions horizontally the tops of said passages being formed by the bottom of the annealing chamber A as shown in Figs. 1, 3 and 1. At their outer ends these passages discharge into the spaces or narrow chambers at formed between the side walls 5 of the annealing chamber and the outer side walls 5 of the furnace. Baflie plates 6 are arranged approximately half way the height of the chambers 4 and extend from the ends of the latter toward the middle of these chambers as shown in Figs. 1 and 2. As these chambers are uninterrupted except for occasional spacing and tying bricks to support the side walls 5 of the annealing chamber, the products of combustion flow freely along these chambers toward the ports 7 between the inner ends of the baffle plates 6 and into the chamber 4 above the baflie wall 6.

Narrow spaces or chambers 8 and 8 are Specification of 'Letters Patent.

Application filed September 15, 1913.

PatentedJ an. 6, 1914.

:Serial No. 789,814.

formed between the-end walls 9 of'the annealing chamber and the end walls 9 of the furnace, said chambers being separated one from the other by baffle-walls 10 extending from the side walls of the furnace toward the middle of the chambers at the ends of the annealing chamber, as shown in Figs. 2, 3 and 4. The lower outer corners of the lower end chambers 8 are connected by lines 11 to stack flues 12, As the upper side chambers 1 connect with the upper end chambers 8 at the corners of the annealing chamber, the products of combustion as they flow through ports 7 are drawn toward the ends of the chambers 45 around the corners of the annealing chamber into the upper end chambers 8*. From these chambers the products of combustion flow down through ports 13 between the inner adjacent ends of the baffles 10 into the lower end chambers and separate into two streams and flow into the fines 11 and thence to the stack flues. By reference to Figs. 2 and 3 it will be seen that the lower side chambers 1 are separated from the lower end chambers 8 by walls 18.

It is characteristic of my improved furnace that the products of combustion flow in a plurality of streams into the lower portions of the chambers 4 and converge into one stream midway of the sides of the annealin chamber. After passing through ports the products of combustion separate into two oppositely flowing streams on both sides of the annealing chamber pass around the corners of the latter and fiow together at the ports 13, and again separate and flow to the fines 11. Thus the bottom, sides and ends of the annealing chamber will be uniformly heated.

During the annealing operation the open top of the annealing chamber is hermetically sealed by a cover 14 provided around its lower edge with flanges 15, which project down into sand or other suitable material contained in troughs 16 in the top of the wall of the furnace. If the furnace is long the cover is preferably made in sections as shown in Fig. 1, and the strengthening or bracing channels 17 adjacent to the ends of the sections are arranged to form troughs for the reception of sand or other material to seal the joint bet-ween sections.

By employing an annealing chamber having an open top, the articles after being annealed can be removed quickly by an electromagnet, to which the articles will adhere and also to one another.

I claim herein as my invention:

An annealing furnace, having in combination therewith an open topped annealing chamber so arranged within the outer walls of the furnace as to form spaces at sides and ends of the annealing chamber, horizontal baffles dividing said spaces into upper and lower compartments, said baffles having ports therethrough at the sides and ends of the annealing chamber, a flue extending under the annealing chamber, passages eX- tending transversely under the bottom of 15 the annealing chamber and connecting said flue With the lower side compartments and outlet fiues extending from the lower end compartments to the stack flue.

In testimony whereof, I have hereunto set 20 my hand.

GEORGE J. HAGAN.

lVitnesses ALICE A TRILL, F. B. JOYCE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. C. 

